JP5883657B2 - Artificial grass durability tester and artificial grass - Google Patents

Description

  The present invention relates to an artificial turf durability tester for evaluating the durability performance of an artificial turf filled with a filler between piles, and more specifically, maintainability capable of performing an endurance test in a state close to actual use. Relates to a good durability tester for artificial turf.

  Artificial turf filled with fillers between piles is widely used as an artificial turf surface with characteristics similar to natural turf in various athletic facilities such as soccer, rugby and baseball fields. In recent years, taking advantage of the all-weather feature, it has been increasingly used for school grounds year by year, and the utilization rate of artificial grass has been increased.

  Artificial turf is loaded by various shoes such as sports shoes with rubber soles, various spikes, etc., so as the operating rate improves, wear due to friction with various shoe soles and repeated durability are sufficient. Evaluation is indispensable, and various endurance tests are conducted.

  Representative examples of artificial turf durability testing machines include a lisport testing machine and a flat sole testing machine. As shown in FIG. 8, in the squirrel testing machine 1a, the iron grass 3 having a large number of points (studs) 4 provided on the soccer spikes on the surface is repeatedly reciprocated on the artificial grass 2, thereby regenerating the artificial grass. Durability tests are conducted. (See Patent Document 1 for a similar example.)

  However, according to the re-sport testing machine 1a, the point 4 attached to the iron wheel 3 disturbs the filler filled in the artificial turf 2 during the reciprocating motion, so that wrinkles are formed while the reciprocating motion is repeated. As a result, there is a possibility that the artificial turf pile may partially fall out or damage the base fabric. Therefore, it is necessary to periodically stop the operation to smooth out the filler or to refill the filler.

  On the other hand, as shown in FIG. 9, the flat sole testing machine 1 b reciprocally rubs a rubber plate 5 imitating the bottom of an athletic shoe on an artificial turf 2 laid on a test stand by a slide device 6. As a result, the artificial turf durability test is conducted.

  However, the flat sole testing machine 1b cannot prevent the movement of the filler as in the case of the re-sport testing machine 1a, and requires regular leveling work and refilling work of the filling material on a regular basis.

  In addition, the re-sport test 1a is back and forth, left and right, and the flat sole testing machine 1b is merely reciprocated back and forth, and does not have a twisting operation (torsional operation) mode similar to the movement of the foot. It could not be said that durability performance could be evaluated in an approximate state.

  In addition, each testing machine is a large-scale device, both the size of the specimen and the weight of the wear mechanism that gives the load are large, and it takes time and labor to replace the specimen and to maintain the filler during the test. There's a problem.

Japanese Patent No. 3210426

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide an artificial turf durability tester capable of performing a stable test over a long period of time in a state closer to a use state. There is to do.

  In order to solve the above-described problems, the present invention has several features described below. That is, in an artificial turf durability tester for applying a predetermined load to an artificial turf filled with a filler between piles and testing the durability of the artificial turf, the artificial turf is passed through a predetermined fixing means. And a compression unit that applies a predetermined compression load to the artificial turf while rotating about a rotation axis that is substantially orthogonal to the test table, the compression unit on the lower surface It has a contact portion that contacts the artificial turf and rotates by a predetermined rotation driving means, and has a contact portion that contacts the artificial turf on the lower surface and is provided on the outer periphery of the first compressor. And a ring-shaped second compressor arranged coaxially along the second compressor, wherein the second compressor rotates following the rotational motion of the first compressor via a lost motion mechanism. Yes.

  As a more preferred aspect, the lost motion mechanism includes a keyway formed in one of the first compressor and the second compressor, and either the first compressor or the second compressor. It is characterized by comprising a key that engages with the formed keyway.

  As a more preferred aspect, the lost motion mechanism is characterized in that the rotational movement amount of the first compressor and the rotational movement amount of the second compressor are set to be substantially the same.

Further, the above contact portion of the first Asshukuko, the contact portion of the second Asshukuko is characterized in that is present on the same plane.

  Furthermore, the rotation driving means is characterized in that the first compressor is reciprocally rotated with a predetermined angular width.

The test stand has a cylinder arranged coaxially with the rotation axis of the rotation driving means, the artificial turf is installed at the bottom of the cylinder, and the second compressor is arranged inside the cylinder. The cylinder and the compressor are formed so as to be coaxially inserted along a peripheral surface, and the inner diameter of the cylinder is D1, the diameter of the second compressor is D2, and the average particle diameter of the filler is d. Is
D1-D2 <d
It is characterized by being formed to satisfy

  The present invention also includes an artificial turf having the following durability performance by the durability test for artificial turf. That is, using the artificial turf durability tester according to any one of claims 1 to 4, the compression load is 300 to 3000 N, the rotation angle is 5 to 45 °, and the rotation speed is 10 to 50 rpm. The contactor has a durability performance of 50,000 times or more reciprocally on the artificial turf.

  ADVANTAGE OF THE INVENTION According to this invention, the compressive load of the torsion operation | movement close | similar to a motion of a person's foot can be applied to artificial turf, and the endurance test which approximated the use condition more can be performed. Furthermore, the compression part comprises a disk-shaped first compressor and a ring-shaped second compressor disposed on the outer periphery of the first compressor, and they are connected via a lost motion mechanism, The rotational movement amount of the first compressor and the second compressor can be changed, and the durability performance closer to the use state can be tested.

  The lost motion mechanism includes a key groove formed on one of the first compressor and the second compressor and a key formed on either of the two, with respect to both end surfaces of the key groove in the rotation direction. By forming the key so as to come into contact with a predetermined rotation amplitude, the number of rotations and the rotation angle can be freely adjusted, and the state of use can be made closer.

  Furthermore, the lost motion mechanism is configured such that the rotational movement amount of the first compressor and the rotational movement amount of the second compressor are the same, thereby providing a load amount per unit area ( The number of rotations) can be made uniform, and the test can be performed in a state close to the use state.

Further, the and the contact portion of the first Asshukuko, the contact portion of the second Asshukuko, by being present in the same plane, it is possible to friction under the same conditions to the artificial grass. Furthermore, the rotation driving means can test the entire artificial turf with a uniform load by reciprocatingly driving the first compressor with a predetermined angular width.

  The test stand has a cylinder arranged coaxially with the rotation axis of the rotation driving means, the artificial turf is installed at the bottom of the cylinder, and the second compressor includes the cylinder Is formed so that it can be coaxially inserted along the inner peripheral surface of the cylinder, the inner diameter of the cylinder is D1, the diameter of the second compressor is D2, and the average particle diameter of the filler is d. Since the compressor is formed so as to satisfy D1-D2 <d, not only can the filler be prevented from falling out of the gap between the cylinder and the compressor, but also the usage state can be maintained for a long time. Can be kept uniform throughout.

  The present invention also includes an artificial turf having the following durability performance by the artificial turf durability test. That is, using the artificial turf durability tester according to any one of claims 1 to 4, the compression load is 300 to 3000 N, the rotation angle is 5 to 45 °, and the rotation speed is 10 to 50 rpm. By providing the contactor with a durability performance of 50,000 times or more reciprocally on the artificial turf, it is possible to provide a more durable artificial turf.

1 is a schematic configuration diagram of an artificial turf durability tester according to an embodiment of the present invention. The (a) top view and (b) plane center cross-sectional view of the cylinder of the durability tester for artificial turf. The disassembled perspective view of the compression part of the said durability tester for artificial grass. (A)-(d) The typical perspective view of the contact body of a compressor. The partial center cross-sectional view of the said compression part. The AA sectional view taken on the line of FIG. 5 of the said compression part. The fragmentary sectional view which showed typically the state which attached the fixing ring to the test stand. Schematic diagram of a conventional re-sport testing machine. Schematic diagram of a conventional flat sole testing machine.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  As shown in FIG. 1, the artificial turf durability tester 10 includes a test table 20 on which an artificial turf 2 as a test object is placed, and a rotation substantially orthogonal to the artificial turf 2 of the test table 20. A compression unit 30 that compresses while rotating by an axis, and a control unit 40 that controls them are provided.

  The test table 20 has a base 21 that is installed on a surface to be installed (both not shown) such as a floor in a state where the entire test base 20 is fixed to a sturdy frame. A mounting stage 22 is formed.

  The mounting stage 22 has a disk shape, and a fixed cylinder 23 on which the artificial turf 2 is disposed is coaxially provided on the mounting stage 22. A guide recess 222 for positioning the fixed cylinder 23 is provided on the lower surface of the mounting stage 22.

  A fixing pin 221 for fixing the fixed cylinder 23 is provided on the upper surface of the mounting stage 22. In this example, four fixing pins 221 are provided at intervals of 90 °, but the number and installation location may be arbitrarily selected.

  Referring also to FIG. 2, the fixed cylinder 23 includes a bottomed cylindrical cylinder body 231 having a hollow portion 232 in which the artificial turf 2 is installed in the center, and a flange integrally formed at the lower end of the cylinder body 231. Part 233.

  At the bottom of the fixed cylinder 23, a guide convex portion 234 formed so as to conform in shape to the guide concave portion 222 of the mounting stage 22 described above is provided, and by aligning these with each other, the mounting stage So-called centering can be performed in which the relative positions of 22 and the fixed cylinder 23 are matched.

  The flange portion 233 is provided with an insertion hole 235 into which a fixing pin 221 protruding from the upper surface of the mounting stage 22 is inserted. The four insertion holes 235 are provided in the same number as the number of the fixing pins 221. The fixing cylinder 23 is fixed to the mounting stage 22 by inserting the fixing pin 221 into the insertion hole 235.

  A knurled surface 236 as anti-slip means is provided at the bottom of the cylinder body 231 so that the artificial turf 2 placed thereon does not slip by rotation. In this example, a knurling process is used as the anti-slip means, but it may be a rubber surface or the like, and any anti-slip effect can be obtained between the bottom of the cylinder body 231 and the artificial turf 2. For example, it may be arbitrarily selected according to the specification.

  Referring again to FIG. 1, the compression unit 30 measures the compression stress applied to the compressor 31 that presses the artificial turf 2, the actuator 32 that moves the compressor 31 up and down, and rotationally drives the compressor 31. And a transmission shaft 34 for transmitting the rotational driving force of the actuator 32 to the compressor 31. Both the actuator 32 and the load cell 33 are electrically connected to the control unit 40.

  Referring to FIG. 3, the compressor 31 includes a disk-shaped first compressor 311 integrally attached to a lower end of a transmission shaft 34 having a rotation axis substantially orthogonal to the artificial turf 2, and a first compression. And a second compressor 312 arranged coaxially along the outer peripheral surface of the child 311. A contact portion 313 with respect to the artificial turf 2 is detachably provided on the lower surfaces (thrust surfaces facing the artificial turf 2) of the first compressor 311 and the second compressor 312.

  In this example, as shown in FIG. 4A, the contact portion 313 is made of a rubber sheet formed in a disk shape, and a first contact portion 313 a attached to the first compressor 311 and a second compression It is divided into a second contact part 313b attached to the child 312. The contact portion 313 is fixed by, for example, screwing, but the fixing method may be arbitrary.

  In this example, a rubber sheet is used for the contact portion 313, but in addition to this, as shown in FIG. Spike specifications with a large number of 313c are also available. In the drawing, spikes for soccer are used, but spike pins for athletics, baseball, golf, etc. may be used.

  Furthermore, as shown in FIGS. 4C and 4D, a rubber sole sole specification for athletic shoes is also prepared in order to reproduce the use situation in a general schoolyard or the like. Here, FIG. 4C illustrates a case where the sole grooves are parallel grooves, and FIG. 4D illustrates the case where the sole grooves intersect, but other shapes may be used.

  As shown in FIGS. 3, 5, and 6, the first compressor 311 is coaxially attached to the lower end of the transmission shaft 34, and the first contact portion 313 a described above is provided on the lower surface thereof. The second compressor 311 is provided with a guide hole 351 into which the first compressor 311 is coaxially inserted in the center, and a second contact portion 313b is integrally provided on the lower surface thereof.

The guide hole 351 is a through-hole penetrating in the axial direction, and the first compressor 311 is disposed in the guide hole 351 so that the first contact portion 313a and the second contact portion 313b exist on the same plane. .

  The first compressor 311 and the second compressor 312 are connected via the lost motion mechanism 35 so that the rotational driving force from the actuator 32 is transmitted. In this embodiment, the lost motion mechanism 35 is formed in the key groove 352 provided on the inner peripheral surface side of the second compressor 312 and the outer peripheral surface of the first compressor 311, and is disposed in the key groove 352. Key 353.

  The key groove 352 is formed so as to protrude outward from the guide hole 351, and is formed in a fan shape having the same curvature as the guide hole 351. In this example, the guide groove 352 is formed so as to be symmetric with respect to the central axis.

  For convenience of explanation, for example, it is assumed that the radius R1 of the first compressor 311 is 50 mm, the radius R2 of the second compressor 312 is 100 mm, and the horizontal axis XX is 0 ° of the rotation reference.

  First, when the first compressor 311 and the second compressor 312 are integrally formed, when the first compressor 311 is reciprocally rotated at a constant angle, the outer diameter side of the first compressor 311 on the center side is reduced. The amount of rotational movement of the second compressor 312 increases, and the amount of friction with respect to the artificial turf 2 increases from the center toward the outer diameter side. That is, a frictional gradient is generated from the center of the artificial turf 2 to the outside, making it difficult to reproduce the actual usage state.

  Therefore, in the present invention, since the rotational movement amounts of the first compressor 311 and the second compressor 312 are substantially the same, in this embodiment, the rotation angle α1 of the first compressor 311 rotates reciprocally by ± 30 °. On the other hand, the key 351 and the key groove 352 are formed in contact with each other at a position where the rotation angle α2 of the second compressor 312 reciprocates by ± 15 °, that is, 30-15 = 15 ° lost motion. . The swing width of the lost motion mechanism may be arbitrarily changed according to the specification.

  In this example, it is preferable that the tolerance between the key 351 and the guide groove 352 be within a range of 0 to 0.5 mm. That is, if the tolerance exceeds 0.5 mm, rotation is lost, which is not preferable.

  The actuator 32 is composed of, for example, an actuator having an up / down lifting mechanism and a rotation mechanism, and rotates while compressing the compressor 31 to the artificial grass with a predetermined stress according to an instruction from the control unit 40.

  In this example, the actuator 32 uses a hydraulic vertical lifting mechanism. However, the actuator 32 may be, for example, a pneumatic type or a mechanical type such as a screw. As long as it can be compressed by a predetermined compressive stress and the compressor 31 can be rotated, the specific mode may be arbitrary.

  In this embodiment, the actuator 32 includes a motor (not shown) as a rotation driving means. However, the motor includes a stepping motor that can arbitrarily set a rotation direction (forward rotation, reverse rotation), a rotation angle, a rotation speed, and the like. It is preferably used and operates according to an instruction from the control unit 40. The motor 21 may be an AC / DC motor instead of a stepping motor.

  One end of the transmission shaft 34 is connected to the actuator 32, and the above-described first compressor 311 is integrally formed at the tip (lower end in FIG. 3). The first compressor 311 may be integrated with the transmission shaft 34 or may be detachable.

  Referring to FIG. 1 again, the artificial turf 2 has piles 2b planted on the base fabric 2a at predetermined intervals, a backing material 2c for preventing the piles 2b from being removed, and a filler between the piles 2b. It is used for the test with 2d filled. In this example, as the filler 2d, an elastic rubber chip made of crushed waste tires, sand, or the like may be used.

In the durability tester 10 for artificial turf of the present invention, when the inner diameter of the cylinder 23 is D1, the outer diameter of the second compressor 312 is D2, and the average particle diameter of the filler 2d is d, the cylinder 23 and the compressor 31 are ,
D1-D2 <d
It is formed to satisfy.

  According to this, since the clearance between the cylinder 23 and the second compressor 312 is smaller than the average particle diameter d of the filler 2d, the filler 2d is scraped from the artificial turf 2 by the compressor 31, It will not move or stick out.

  Usually, since the granular material with an average particle diameter of 2.0 mm is used for a filler, 0.1-1.5 mm is preferable and, as for clearance, 0.5-1.0 mm is more preferable. That is, when the clearance is less than 0.1 mm, mechanical accuracy is required, and therefore, the compressor 31 may come into contact with the cylinder 23 during the test, which is not preferable. On the contrary, if the opening is 1.5 mm or more, the filler enters the gap, which is not preferable.

  When the actuator 32 is rotated in a state in which the compressive stress at the compressor 31 is increased, the contact resistance between the artificial turf and the compressor exceeds the contact resistance between the artificial turf and the cylinder bottom, thereby causing the slip of the knurl surface 236 described above. Even if the stopping means is used, there is a possibility that the artificial turf 2 may be displaced from the test table 20 or run idle.

  Therefore, in order to more reliably prevent such deviation and idling, it is more preferable to combine the other fixing means to fix the artificial turf 2 to the test table 20.

  As shown in FIG. 7, in this example, the fixing means includes a fixing ring 24 inserted inside the cylinder body 231. The fixing ring 24 is made of, for example, iron and has a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the cylinder body 231, and a female screw hole 241 for screwing is provided at the lower end.

  When the artificial turf 2 is fixed using the fixing ring 24, the artificial turf 2 is removed by previously removing the pile 2 b at the portion (in this example, the outer peripheral portion) with which the fixing ring 24 abuts to expose the base fabric 2 a. It is preferable to keep it.

  According to this, after the artificial turf 2 is installed at the bottom of the cylinder body 231, the artificial turf 2 is sandwiched between the cylinder body and the fixing ring 24 by inserting the fixing ring 24 and further tightening with the screw 242. Thereby, the artificial turf 2 can be fixed reliably.

  Therefore, when the fixing ring 24 is used, it is preferable that the inner diameter of the fixing ring 24 is D3 and the above-described clearance is D3-D2 <d.

  Next, an example of a procedure for using the artificial turf durability tester 10 will be described with reference to FIG. First, the artificial turf 2 is installed in advance at the bottom of the cylinder body 231 of the test table 20. Next, for example, the contact portion 313 is selected from FIGS. 4A to 4D and attached to the tip of the compressor 31.

  When a test start button (not shown) is pressed, the control unit 40 issues a lowering command to the actuator 32, and in response to this, the compressor 31 starts to lower. At the same time, the control unit 40 receives the compressive stress data from the load cell 33.

  The control unit 40 stops the lowering operation by the actuator 32 at a position where a predetermined compressive stress is obtained while measuring the load applied to the load cell 33 when the compressor 31 comes into contact with the artificial grass 2. Next, the control unit 40 issues a rotation command to the motor, and in response to this, the motor starts rotating.

  First, the control unit 40 rotates the first compressor 311 through the motor by + 30 ° in the forward direction (+ direction in FIG. 6). Accordingly, the key 353 moves in the + direction in the key groove 352, and the + end 353a of the key 353 comes into contact with the + end 352a of the key groove 352 at a position rotated + 15 °.

  When the first compressor 311 is further rotated, the second compressor 312 follows and rotates in the + direction. That is, until the first compressor 311 rotates from 0 ° to + 15 °, the rotation of the second compressor 312 is stopped by the lost motion mechanism 35 and rotates together at + 15 ° to + 30 °.

  When the + 30 ° rotation is completed, the control unit 40 rotates the first compressor 311 by −60 ° in order to rotate 30 ° in the − direction. The first compressor 311 is rotated by −60 ° in the backward direction (− direction in FIG. 6), and the − end 353b of the key 353 comes into contact with the − end 352b of the key groove 352 at a position rotated by −45 °.

  When the first compressor 311 is further rotated at this position, the second compressor 312 follows and rotates by 15 ° in the − direction. By repeating this, the first compressor 311 and the second compressor 312 reciprocate with the same rotational movement amount, and the artificial turf 2 can be brought into uniform contact. In this example, the rotational movement amount of the second compressor 312 is set to be half of the rotational movement amount of the first compressor 311.

  The controller 40 continues to monitor the load cell 33 even when the motor rotates, and controls the actuator 32 so that a constant compressive stress is always applied to the artificial turf 2. When a predetermined endurance time has elapsed based on a predetermined endurance test program, the control unit 40 stops the reciprocal rotation of the motor, lifts the compressor 31 via the actuator 32, and stops the compression test.

  The control program can be freely programmed using the characteristics of the stepping motor, such as its rotation speed and rotation angle, in addition to the method of simply rotating the motor back and forth.

  Further, when the durability test of the artificial grass 2 is performed using the durability test 1 for artificial grass of the present invention, the compression load is 300 to 3000 N (desirably 500 to 2000 N), and the rotation angle is 5 to 45 ° (desirably 10). ~ 20 °), an artificial turf having durability conditions under which a durability test is performed under conditions of a rotational speed of 10 to 50 rpm and no cracks or tears occur even if the compressor 31 is rubbed against the artificial turf 2 more than 50,000 times. .

  In this example, the compression unit 31 is divided into two parts, a first compressor 311 and a second compressor 312. However, when the amount of rotational movement is to be controlled more finely, the compression part 31 is further divided into concentric circles. Similarly, they may be connected by a lost motion mechanism.

  Furthermore, in this example, the lost motion mechanism is composed of a key groove 352 and a key 353, but may be controlled by other mechanical means using a gear ratio or a cam other than this. Furthermore, the rotations of the first compressor 311 and the second compressor 312 may be controlled independently by independent motors.

  As described above, according to the present invention, it is possible to reproduce a load related to an actual artificial grass (a person twisting with a foot), and to perform a durability test that more closely approximates the usage environment. Since the amount of rotation per unit area of the compressor is uniform through the transmission means, the load amount in the contact surface of the compressor can be kept constant. Further, since the filler is difficult to move, the artificial turf can be evenly worn, and it is possible to save the effort of leveling and refilling the filler during the test.

DESCRIPTION OF SYMBOLS 10 Endurance testing machine for artificial grass 20 Test stand 21 Base 22 Placement stage 23 Cylinder 30 Compression part 31 Compressor 311 1st compressor 312 2nd compressor 313 Contact part 32 Actuator 33 Load cell 34 Transmission shaft 35 Lost motion mechanism 351 Guide hole 352,352 Key 353,353 Keyway

Claims (7)

In an artificial turf durability tester for applying a predetermined load to an artificial turf filled with a filler between piles and testing the durability of the artificial turf,
A test table on which the artificial turf is installed via a predetermined fixing means; and a compression unit that applies a predetermined compression load to the artificial turf while rotating about a rotation axis that is substantially orthogonal to the test table. The compression part has a contact part that contacts the artificial turf on the lower surface, and has a disk-shaped first compressor that is rotated by a predetermined rotation driving means, and a contact part that contacts the artificial turf on the lower surface. And a ring-shaped second compressor disposed coaxially along the outer periphery of the first compressor, the second compressor rotating through the lost motion mechanism. Durability tester for artificial turf, characterized by rotating following the surface.   The lost motion mechanism includes a keyway formed in one of the first compressor and the second compressor, and the key formed on the other of the first compressor and the second compressor. The durability tester for artificial turf according to claim 1, comprising a key that engages with the groove.   3. The lost motion mechanism according to claim 1, wherein the rotational movement amount of the first compressor and the rotational movement amount of the second compressor are set to be substantially the same. The durability tester for artificial turf described. And said contact portion of said first Asshukuko, the above contact portion of the second Asshukuko is artificial turf for durability testing machine according to claim 1, 2 or 3, characterized in that it is present in the same plane .
  5. The artificial turf durability tester according to claim 1, wherein the rotation driving unit reciprocally rotates the first compressor with a predetermined angular width. 6. The test bench has a cylinder arranged coaxially with the rotation axis of the rotation driving means, and the artificial turf is installed at the bottom of the cylinder,
The second compressor is formed so as to be coaxially inserted along the inner peripheral surface of the cylinder, the inner diameter of the cylinder is D1, the diameter of the second compressor is D2, and the average particle size of the filler When the diameter is d, the cylinder and the compressor are
D1-D2 <d
The durability tester for artificial turf according to any one of claims 1 to 5, characterized in that:   Using the artificial turf durability tester according to any one of claims 1 to 6, the first load under conditions of a compression load of 300 to 3000 N, a rotation angle of 5 to 45 °, and a rotation speed of 10 to 50 rpm. And an artificial turf having durability that can endure 50,000 or more reciprocating motions by the second compressor.

Images